Regenerative braking system for car

Claim 2

A regenerative braking system for car comprising; a hydraulic oil circuit formed of a high pressure accumulator, a pump/motor, a circuit valve, and a low pressure accumulator, an electromagnetic clutch for connecting or disconnecting said pump/motor to or from a PTO unit, means for sensing the position of an accelerator pedal, means for sensing the pressure of said hydraulic oil circuit, means for sensing the position of gear of a transmission, control means for determining driving torque required for the car according to the sensed position of said accelerator pedal and the sensed position of the gear, and for determining the motoring capacity of said pump/motor from the determined driving torque and the sensed pressure of said hydraulic oil circuit, said control means decoupling the engine of the car, coupling said electromagnetic clutch, and closing said hydraulic oil circuit in which said pump/motor is controlled to have the determined motoring capacity in the accelerating mode of the car.

Claim 3

A regenerative braking system for car according to claim 1, wherein said control means includes therein a map previously storing the position of said accelerator pedal and driving torque per each gear position.

Claim 4

A regenerative braking system for car according to ciaim 2, wherein said con troi means calculate the motoring capacity of said pump/motor by using the following Equation, V P =200πT/P where V P indicates the motoring capacity, T indicates the required driving torque, and P indicates the sensed pressure of said hydraulic circuit.

Claim 5

A regenerative braking system for car according to ciaim 2, wherein said con troi means calculate the motoring capacity of said pump/motor by using the following Equation, V P =200πT/P where V P indicates the motoring capacity, T indicates the required driving torque, and P indicates the sensed pressure of said hydraulic circuit.

Claim 6

A regenerative braking system for car according to ciaim 3, wherein said control means control the displacement angle of said pump/motor of a swash plate type to have the determined motoring capacity.

Claim 7

A regenerative braking system for car according to ciaim 3, wherein said control means control the displacement angle of said pump/motor of a swash plate type to have the determined motoring capacity.

Claim 8

A regenerative braking system for car according to claim 1, wherein said control means switches over said circuit valve so that said hydraulic circuit may have therein the hydraulic flow from said high pressure accumulator to said low pressure accumulator.

Claim 9

A regenerative braking system for car according to claim 1, wherein said control means controls an engine clutch to decouple the engine.

Claim 10

A regenerative braking system for car comprising; a hydraulic oil circuit formed of a high pressure accumulator, a pump/motor, a circuit valve, and a low pressure accumulator, an electromagnetic clutch for connecting or disconnecting said pump/motor to or from a PTO unit, means for sensing the position of an accelerator pedal, means for sensing the pressure of said hydraulic oil circuit, means for sensing the position of gear of a transmission, control means for determining driving torque required for the car according to the sensed position of said accelerator pedal and the sensed position of the gear, and for determining the motoring capacity of said pump/motor from the determined driving torque and the sensed pressure of said hydraulic oil circuit, said control means coupling the engine of the car and said electromagnetic clutch, and closing said hydraulic oil circuit in which said pump/motor is controlled to have the maximum motoring capacity and the engine is controlled to have the output for supplementing the short torque when the determined driving torque exceeds the maximum motoring capacity in the accelerating mode of the car.

Claim 11

A regenerative braking system for car comprising; a hydraulic oil circuit formed of a high pressure accumulator, a pump/motor, a circuit valve, and a low pressure accumulator, an electromagnetic clutch for connecting or disconnecting said pump/motor to or from a PTO unit, means for sensing the position of an accelerator pedal, means for sensing the pressure of said hydraulic oil circuit, means for sensing the position of gear of a transmission, control means for determining driving torque required for the car according to the sensed position of said accelerator pedal and the sensed position of the gear, and for determining the motoring capacity of said pump/motor from the determined driving torque and the sensed pressure of said hydraulic oil circuit, said control means coupling the engine of the car and said electromagnetic clutch, and closing said hydraulic oil circuit in which said pump/motor is controlled to have the maximum motoring capacity and the engine is controlled to have the output for supplementing the short torque when the determined driving torque exceeds the maximum motoring capacity in the accelerating mode of the car.